A storm system is inbound for the northern Illinois area Sunday evening through Monday evening, according to the National Weather Service. | Graphic via NWS

The National Weather Service is warning of possible flooding as a “robust storm system” bringing heavy rain and high winds are expected Monday in the Chicagoland area.

The storm system will impact the area beginning Sunday evening and continue into Monday.

Widespread rain across parts of northern Illinois and northwestern Indiana will become heavy at times and could lead to localized flooding, according to the National Weather Service (NWS).

Local areas may receive rainfall amounts high enough to cause river rises, widespread ponding of water and localized flooding.

“After a recent soaking rainfall and freezing temperatures, soil moisture is nearly ubiquitously above average in northern Illinois and northwestern Indiana,” the NWS said in a hydrologic outlook.

The current forecast of three-quarters to one inch of rainfall may cause river stages to rise to near or above bankfull, particularly along the Fox, Des Plaines, Rock and Kankakee River basins, according to the outlook.

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A few thunderstorms are likely, some of which could be strong to potentially severe, the NWS said.

The threat of severe weather is between 6-10 a.m. Monday primarily along and south of Interstate 80.

Wind gusts over 40 mph are expected Monday and Monday evening.

The “rollercoaster” in temperatures will continue for the foreseeable future, the NWS said.